Yeah, not a real wise idea, removing safety device/third brake light, at least in litigious California. Arizona probably no much better.
Of course, doubt anybody would catch it, Police etc. A lot of cars on the road without such devices and you have to really know your cars/trucks to pinpoint make/model/year and whether or not a third brake light or certain safety device came with a vehicle and was illegally removed.
But, yeah, "removal" could potentially put you on defense in a Civil Suit. If they worked at it, they could make a case for negligence on your part. :|